straightedge Meaning, Definition & Usage

  1. noun hand tool consisting of a flat rigid rectangular bar (metal or wood) that can be used to draw straight lines (or test their straightness)

WordNet


Straight"edge` noun
Definitions
  1. A board, or piece of wood or metal, having one edge perfectly straight, -- used to ascertain whether a line is straight or a surface even, and for drawing straight lines.

Webster 1913